CVE-2026-38360 is a critical-severity (CVSS 9.8) Path Traversal vulnerability in dash-uploader. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
dash-uploader has a directory traversal vulnerability
Exploitation Status
No confirmed exploitation observed yet
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-38360.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
dash-uploaderReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Impact
An unauthenticated path traversal vulnerability exists in dash-uploader versions 0.1.0 through 0.7.0a2. The library's HTTP request handler at dash_uploader/httprequesthandler.py reads three form parameters (upload_id, resumableFilename, resumableIdentifier) from request.form.get() and passes them directly to os.path.join() and os.makedirs() without any sanitization.
A single unauthenticated POST /API/dash-uploader request with upload_id set to a relative path (e.g. ../../etc/cron.d or ../venv/lib/python3.13/site-packages) escapes the application's uploads/ directory and writes the supplied file content to the chosen target path under the privilege of the gunicorn / WSGI process.
When the chosen target is a Python site-packages directory and the dropped file is a .pth file containing an import-prefixed line, Python's site module executes that line on the next interpreter startup, yielding remote code execution. Other escalation paths reachable from the same primitive include overwriting the running WSGI module, dropping ~/.ssh/authorized_keys, or writing JavaScript into a Dash-served assets/ directory for stored XSS.
Affected versions
All 16 published PyPI releases (0.1.0 through 0.7.0a2) are affected. The package repository was archived on 2025-07-19; no patched version exists.
Mitigation
Replace dash-uploader with an alternative file-upload component (for example, dash-resumable-upload, server-rendered <input type=\"file\"> plus a hardened Flask endpoint, or a maintained Dash community alternative). There is no upstream fix path.
While a replacement is being deployed, mitigations include:
- Block
POST /API/dash-uploaderat an upstream proxy, OR - Run the application as an unprivileged user with no write access to its own
site-packages, OR - Use a read-only filesystem for the application's code directories.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | dash-uploader | ≥ 0.1.0 | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for dash-uploader, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of dash-uploader for CVE-2026-38360. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.
How to detect CVE-2026-38360
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2026-38360 -u https://target- Template
- dash-uploader 0.1.0 - 0.7.0a2 - Unauthenticated Arbitrary File Write via Path Traversal
- Severity
- critical
Template by ProjectDiscovery nuclei-templates (a1ohadance), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2026-38360 in your dependencies?
Find it across PyPI, including transitive dependencies.